type struct_t = [ | `Log_a2af2945d72d0ea5
]val log_get : t -> stringval log_set : t -> string -> unitval next_get : t -> int64val next_get_int_exn : t -> intval next_set : t -> int64 -> unitval next_set_int : t -> int -> unitval init_root : ?message_size:int -> unit -> t